Crash Joining a 1.7.10 or 1.7.9 Server

Put the summary of the bug you're having here

What I expected to happen was...:
Connect to a server

What actually happened was...:
Game Crashed

Steps to Reproduce:
1. Open MC
2. Select Multiplayer
3. Select the server (Runs 1.7.10)
4. Logging In and crashes